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RPI+/CPI - Each year, your Pay Monthly airtime tariff will be adjusted according to RPI+ (O2) or Consumer Price Index (Three & Vodafone) rate of inflation. Your bill will be adjusted in April by the rate announced in January (Three & Vodafone) and February (O2) that year plus 3.9%.

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All pay monthly offers subject to security and credit check. Charges will apply for paper billing. Charges may also apply for non-Direct Debit payment. Promo codes cannot be used in conjunction with any other offer. Full Legals.

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